Do not fear the pelvic floor—although this topic is popular amongst examiners and seems to be complicated at first glance, there is no need for fear. Here, you get a compact overview and learn everything you need to know about the pelvic floor, the abdominal wall and the inguinal canal.

00:01
to the acetabulum.
Now, let's take a look at the ilium. Thisis a lateral view and because of the surface
presentations or features that we see here,they are quite remarkable and pronounced.
This would be more typical of a male.
00:14
Here, we're looking at the ilium, in through
here and some of the components of the iliumthat you should be familiar with would include
the iliac crest. That is seen as this curvedstructure along the superior aspect of the
ilium. At this point along the iliac crest,we have a bony eminence that is referred to
as the tubercle. We also have two bony eminencesanteriorly located. So, the anterior termination
of that iliac crest leads you to a bony prominencethat is readily palpable in a human body.
And this is the anterior superior iliac spine.
01:04
We also have an anterior inferior iliac spine
and we see that eminence at this location.
01:13
On the posterior aspect, we also have two
iliac spines. This is the posterior superioriliac spine and then this is the posterior
inferior iliac spine.
01:30
On the lateral aspect here, we see three prominent
gluteal lines. This is the posterior glutealline. This is the anterior gluteal line. And
then along here, we have the inferior glutealline. And these features will make greater
sense when you study a unit on the glutealregion.
Lastly, we have this prominent notch on theposterior aspect of the ilium. It is just
inferior to the posterior inferior iliac spineand this major notch is referred to as the
greater sciatic notch.
02:18
Now, we're looking at the ilium and our view
is a medial view. And there are three featuresto point out in this particular view. The
first is this line that we see right in throughhere. This is called the arcuate line. And
then above that is a winglike extension ofthe ilium. It is also visible on the lateral
view where we had the gluteal lines. A winglikeextension is known an ala. So, this is the
ala of the ilium. And then located right alonghere, you see the articular surface of the
ilium and this articular portion articulateswith sacrum.
Now, let's turn our attention to the ischiumand our focus here will be a lateral view.
The ischium is in this general area and itextends out anteriorly and inferiorly to about
this particular point. Features of the ischiumthat you should be familiar with would include
this bony eminence. This is at the inferioraspect of the greater sciatic notch and this
bony eminence constitutes the ischial spine.
03:52
Immediately below is a smaller notched-out
area, so this is associated with the ischium.
04:00
This is referred to as the lesser sciatic
notch. Then we have this prominent bony projection.
04:10
This is referred to as the ischial tuberosity.
This supports our weight in a seated position.
04:17
And then we have an anterior projection of
the ischial tuberosity. This is the ischialramus and it will join another ramus, that
being, specifically, the inferior ramus ofthe pubic bone, which is shown here and this
is the junction between those two rami.
04:43
The last bone that makes up the pelvic bone
is the pubic bone. Here, we're looking ata medial view. And let's highlight some of
the features of this particular bone. Thefirst feature is this ramus located along
here. This is referred to as the superiorpubic ramus. Along its superior border, we
see a line. This is referred to as the pectinealline, also known as the pecten pubis. If we
follow the pectineal line out medially, wewill see that there is a bony eminence at
this location and this is called the pubictubercle. Along here, we have the other ramus
of the pubic bone. This is the inferior pubicramus and as mentioned with the ischium, the
inferior pubic ramus joins the ischial ramus.
05:50
There is some controversy as to what constitutes
the actual body of the pubis, but it is quitecommon and frequent to say the point at where
these two pubic rami join in the medial aspectto form this area here. This is commonly called
the body of the pubis and then this medialaspect along here represents a point of articulation
with the opposite body of the pubic bone.
06:24
This, then, constitutes the symphyseal surface.
Now, we're looking at a view of an assembled

About the Lecture

The lecture Ilium and Ischium – Pelvic Wall and Floor by Craig Canby, PhD is from the course Abdominal Wall.

Included Quiz Questions

What is the bony prominence of Ilium that is readily palpable on anterior aspect of human body?

Anterior superior iliac spine.

Greater sciatic notch.

Anterior inferior iliac spine.

Posterior superior iliac spine.

Posterior inferior iliac spine.

How many gluteal lines are present on ilium?

3 lines.

4 lines.

2 lines.

1 line.

5 lines.

Where is ischial spine located?

On ischium.

On ala.

On pubis.

On Ilium.

On ischial tuberosity.

What is the structure that supports our weight in a seated position?

Ischial tuberosity.

iliac crest.

Pubic ramus.

ischial spines.

Pubic tubercles.

The lesser sciatic notch is in which pelvic bone?

Ischium

Ilium

Pubis

Symphisis

Crest

Author of lecture Ilium and Ischium – Pelvic Wall and Floor

Craig Canby, PhD

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